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Performance B.6.3 Deferred tax (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Beginning of period $ (85,000,000) $ (34,000,000)  
(Charge)/credit to income statement 75,000,000 31,000,000  
Change in scope 0 (73,000,000)  
Transfers to assets held for sale 0    
Exchange differences (2,000,000) 0  
End of period (12,000,000) (85,000,000)  
Deferred tax assets (197,000,000) (200,000,000) [1]  
Deferred tax liabilities 209,000,000 285,000,000 [1]  
Deductible temporary differences 4,943,000,000 4,923,000,000  
Unrecognized tax losses 4,668,000,000 4,705,000,000 $ 4,886,000,000
Temporary differences associated with investments in subsidiaries, branches and associates and interests in joint arrangements for which deferred tax liabilities have not been recognised 621,000,000    
Deferred tax assets, intragroup dividends 11,000,000 26,000,000 34,000,000
Offset      
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Deferred tax assets (189,000,000) (52,000,000)  
Deferred tax liabilities 189,000,000 52,000,000  
Fixed assets      
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Beginning of period (223,000,000) (178,000,000)  
(Charge)/credit to income statement 81,000,000 41,000,000  
Change in scope 0 (88,000,000)  
Transfers to assets held for sale 0    
Exchange differences 0 2,000,000  
End of period (142,000,000) (223,000,000)  
Deductible temporary differences 57,000,000 92,000,000  
Fixed assets | Before Offset      
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Deferred tax assets (97,000,000) (84,000,000)  
Deferred tax liabilities 239,000,000 307,000,000  
Unused tax losses      
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Beginning of period 34,000,000 44,000,000  
(Charge)/credit to income statement 150,000,000 (15,000,000)  
Change in scope 0 5,000,000  
Transfers to assets held for sale 0    
Exchange differences 3,000,000 0  
End of period 187,000,000 34,000,000  
Deductible temporary differences 4,668,000,000 4,705,000,000  
Unused tax losses | Before Offset      
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Deferred tax assets (187,000,000) (34,000,000)  
Deferred tax liabilities 0 0  
Unremitted earnings      
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Beginning of period (25,000,000) (34,000,000)  
(Charge)/credit to income statement 15,000,000 8,000,000  
Change in scope 0 0  
Transfers to assets held for sale 0    
Exchange differences (1,000,000) 1,000,000  
End of period (11,000,000) (25,000,000)  
Deferred tax liabilities 0 697,000,000 584,000,000
Unremitted earnings | Before Offset      
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Deferred tax assets 0 0  
Deferred tax liabilities 11,000,000 25,000,000  
Other      
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Beginning of period 129,000,000 134,000,000  
(Charge)/credit to income statement (171,000,000) (3,000,000)  
Change in scope 0 4,000,000  
Transfers to assets held for sale 0    
Exchange differences (4,000,000) (3,000,000)  
End of period (46,000,000) 129,000,000  
Deductible temporary differences 218,000,000 126,000,000  
Other | Before Offset      
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Deferred tax assets (102,000,000) (134,000,000)  
Deferred tax liabilities 148,000,000 5,000,000  
Less than 1 year      
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Unrecognized tax losses 3,000,000 1,000,000 0
1 to 5 years      
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Unrecognized tax losses 3,000,000 2,000,000 3,000,000
After five years      
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Unrecognized tax losses 1,089,000,000 493,000,000 493,000,000
No expiry      
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Unrecognized tax losses $ 3,573,000,000 $ 4,209,000,000 $ 4,390,000,000
[1] The consolidated statement of financial position at December 31, 2019 has been restated after finalization of the purchase accounting of our acquisitions in Nicaragua and Panama (note A.1.2.).